Resinous composition which is useful for the dispersion difficulty dispersible coloring matter

Abstract

A resinous composition for coating use comprising an amphoteric resin having an acidic resinous component and a basic component of a basic compound, and an amino-formaldehyde resin etherified with monohydric alcohol having 1 to 4 carbon atoms and/or isocyanate compound, which is characterized by the fact that the basic component of a said amphoteric resin consists of a basic compound whose titration midpoint potential in non-aqueous potentiometric titration, when incorporated into the resin, is less than 450 mV, and the basicity of the amphoteric resin is within the range of 1.0×10 -2 to 1.0 m mol/g solid. This composition can exhibit excellent pigment dispersibility and is useful as resinous vehicle for a coating composition to be used as a top coat for automobile bodies and the like.

What is claimed is: 
     
       1. A resinous composition for coating use having a greatly improved pigment dispersibility and comprising an amphoteric resin having an acidic resinous component and a basic component of a basic compound, and aminoformaldehyde resin etherified with monohydric alcohol having 1 to 4 carbon atoms, an isocyanate compound or mixture of said amino-formaldehyde resin and isocyanate compound, wherein the basic component of said amphoteric resin consists of basic compound whose titration midpoint potential in non-aqueous potentiometric titration, when incorporated into the resin, is less than 450 mV, and the basicity of the amphoteric resin is within the range of 1.0×10 -2  m mol/g solid. 
     
     
       2. The resinous composition according to claim 1 comprising 45 to 95% by weight of said amphoteric resin and 55 to 5% by weight of said amino-formaldehyde resin, isocyanate compound or mixture therof. 
     
     
       3. The resinous composition according to claim 1 wherein the acidic resinous component of the amphoteric resin consists of polycarboxylic acid whose titration midpoint potential in non-aqueous potentiometric titration, under the condition capable of developing a resinous acid value, is more than -350 mV and the acidity of said amphoteric resin is within the range of 2.0×10 -2  to 3.0 m mol/g solid. 
     
     
       4. The resinous composition according to claim 2 wherein the acidic resinous component of the amphoteric resin consists of polycarboxylic acid whose titration midpoint potential in non-aqueous potentiometric titration, under the state capable of developing resinous acid value, is more than -350 mV and the acidity of said amphoteric resin is within the range of 2.0×10 -2  to 3.0 m mol/g solid. 
     
     
       5. The resinous composition according to claim 1 wherein there is additionally employed in combination therewith quinacridone pigment.